/**
 * Copyright 2019 Anthony Trinh
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package ch.qos.logback.core.pattern.util;

/**
 * This implementation is intended for use in PatternLayout.
 *
 * @author Ceki G&uuml;lc&uuml;
 */
public class RestrictedEscapeUtil implements IEscapeUtil {

  public void escape(String escapeChars, StringBuffer buf, char next,
                     int pointer) {
    if (escapeChars.indexOf(next) >= 0) {
      buf.append(next);
    } else {
      // restitute the escape char (because it was consumed
      // before this method was called).
      buf.append("\\");
      // restitute the next character
      buf.append(next);
    }
  }


}
